ANSYS Innovations in Fluid DynamicsRelease 18.0 Update

John Stokes, M.A.Sc.Director of Software Development

Fluids Aerospace Technology

• ANSYS Fluent: general purpose• ANSYS CFX: turbomachinery Separate Presentation

Flagship Products

• ANSYS Polyflow: materials processing• ANSYS Forte: internal combustion engines• ANSYS Chemkin-Pro: chemical reaction and fuels• ANSYS FENSAP-ICE: aircraft icing

Specialty Products

• ANSYS AIM Pro: CAD, CFD, FEA, EM, Multiphysics

Design Engineers

Product Update

ANSYS CFD Enterprise• Solvers: Fluent, CFX, AIM, Polyflow, FENSAP-ICE, Forte, 4 HPC• PrepPost: Workbench, AIM, SCDM, ACS, Meshing, ICEM-CFD,

TurboGrid, CFD-Post, Viewmerical, OptiGrid, DX, Simplorer Entry

ANSYS CFD Premium• Solvers: Fluent, CFX, 4 HPC• PrepPost: Workbench, SCDM, Meshing, ICEM-CFD, TurboGrid,

CFD-Post, OptiGrid

ANSYS AIM Pro• Solvers: Fluids, Mechanical, 2 HPC• PrepPost: Workbench, SCDM, Meshing

Updated Product Licenses

Updated Product Licenses

• Updated licenses will be announced by letter– Will describe full update process and additional options– Fluent and CFX licensees will receive ANSYS CFD Premium– ANSYS CFD licensees will receive ANSYS CFD Enterprise

• When will you receive the updated licenses?– Automatically at lease/TECS renewal– Sooner by calling your account manager

• Contact your ANSYS Account Manager for information

Flow with Interacting Bodies and Arbitrary Motion

• Many geometries cannot be well represented using a single, contiguous mesh

• Different mesh types required to represent different geometric features

• Preparing appropriate meshes can be time consuming and complicated

• Large, poorly structured meshes can take excessive time to solve and can result in reduced accuracy

Overset mesh can speed and simplify simulations with multiple moving parts. This example includes multiple background and component meshes.

Problem

Flow with Interacting Bodies and Arbitrary Motion

• Extended overset mesh capabilities in ANSYS Fluent to simplify and speed simulations that include– Structured mesh around individual parts– Part swapping– Moving cell zones without having to use

re-meshing or smoothing– Design exploration studies

• Selected ANSYS 18 enhancements– Use with density-based solver and

compressible flows– Increased parallelization to speed

solutions

Hypersonic compressible flow simulation using overset mesh and Fluent’s density-based solver

Solution

Complex Applications with many Zones, Species, etc.

• Difficult management and workflow

• Numerous Usability Improvements– Wildcard filtering of lists and drop-downs– Grouping in list boxes and tree– Copy/Paste selection– Multi-select in tree – Context-sensitive actions– Optimization of zone conversion algorithm– Automatically mesh interface pairing

Problem

Solution

Post-Processing Functionality and Ease-of-Use

• Need for more efficient and powerful flow visualization

• Richer and easier-to-use post-processing– New Persistent Graphics Object types

• Meshes, pathlines, particle tracks, plots– Compound graphics displays

• Transparency controls, colour maps– Pathlines on all Eulerian phases– Smooth contours– Interactive legend sizing and placement– Simplified solution animation workflow

Problem

Solution

Pushing Performance Further

• Ever larger simulations!

PR Nov. 15, 2017: ANSYS, the High Performance Computing Center (HLRS) of the University of

Stuttgart, and Cray Inc. set a new supercomputing world record (172k cores)

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Nose-based gradients optimized to speed external aerodynamics

• New scalability record 172K cores• >10X faster HDF write performance

– 20X faster than non-HDF• Specific algorithmic optimizations

– Sliding interfaces– Node-based gradients

Problem

Solution

Extended and Improved Adjoint Design Optimization

• Broader need for powerful adjoint optimization

• Added support for – Rotating machinery– Conjugate Heat Transfer (CHT)

• Improved solution stability– Suppression option for dissipation

stabilization scheme

Baseline Fan Blade Modified Fan Blade

8-bladed fan, 1900rpm; Objective: Increase mass flow

Optimized heat exchanger fins show 2.1% improvement in heat flux

Problem

Solution

Reacting Flow Modeling

• Need higher accuracy, greater efficiency and better usability

• PDF combustion with real gas– 20% speed-up

• CHEMKIN-CFD for– Surface reactions– ISAT tabulation

• Visualization of FGM PDF tables– Plot 3D surface or 2D curves of 4-

dimensional (adiabatic) and 5-dimensional (non-adiabatic) PDF tables

T

Temperature, compared with experimental data

Problem

Solution

Multiphase Flow Modeling

• Need higher accuracy, greater efficiency and better usability

• New model for water-oil displacement in reservoirs

• Dramatic speedup for transient VOF problems– 25%-50% solver speed-up, increased scalability

• Compressible multiphase robustness and accuracy– Reduced need for solution steering– Key application: high pressure fuel injectors

• Discrete phase/particulate model enhancements– Injection types, erosion models, condensation,

evaporation, …

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ImprovedRun on CRAY XE6

Problem

Solution

Radiation Modeling for Automotive Headlights

• Prohibitive computational expense of Discrete Ordinates (DO) for collimated radiation

• Monte Carlo radiation model– Support for parallel– Support for periodic zones – Support for multiband (non-gray) radiation– Option to disable radiation in solid zones– Post-processing of surface/volume

standard deviation

Problem

Solution

Forming of Materials with Complex Properties

• Common use of material reinforcement– Steel wires, textile fibers, etc.

• Final orientation of reinforcements required for correct evaluation of mechanical strength

• Anisotropic model to track the re-orientation during forming process

Initial orientation or reinforcements Final orientation of reinforcements

Problem

Solution

Internal Combustion Engines

• Need better time and memory scaling of automatic and adaptive meshing, and reduced mesh sensitivity

• Significant meshing performance enhancements– Reduction in RAM– Better scaling with # Processors Faster turnaround time for engine simulations

• Flame front consistency for different mesh resolutions

Problem

Solution

In-Flight Icing Simulation and Systems Design

• Need for tighter integration of FENSAP-ICE for use with established flow solutions from Fluent and CFX

• Need to continue to expand icing physics modeling

• FENSAP-ICE part of ANSYS 18.0– Incorporated in new product licenses– Available as plug-in to ANSYS Workbench

• Numerous modeling advances– Advanced automation for ice growth– Ice crystal re-injection for engine ingestion– Electro-thermal heating for anti-icing

Problem

Solution

ANSYS AIM Pro

ANSYS AIM Pro – Fluids

• Desire to use AIM’s fast, intuitive workflow for larger range of applications

• Many powerful features incorporated– Heat and momentum sources– Solution-dependent expressions– Calculated value monitoring– Periodic interfaces and automation– Non-Newtonian viscosity– Wall roughness

• Connection to ANSYS Fluent for more advanced fluid physics

Problem

Solution

ANSYS AIM Pro – Extrusion

• Make common extrusion modeling more accessible

• Polyflow solver under AIM Pro– Easy extrusion simulation set up– Setup performed directly on

geometry– Clever defaults, user guidance– Numerics handled automatically– Automated solution process– Easy stop and restart

Problem

Solution

ANSYS Apps

• CFD simulations can require training and best practices that go beyond the standard software solution

• Apps provide faster, better simulations– Automate workflows and problem set-up– Capture engineering simulation best

practices and company specific workflows– Application-specific solutions

• Benefit from the ANSYS ecosystem– Written by ANSYS, channel partners,

customers, consultants, universities

Problem

Solution

Example: Virtual Wind Tunnel

• Automatically set-up and assess external aerodynamics

Example: Enhanced Polyhedral Meshing

• Tie advanced polyhedral capability of Fluent Meshing to parametric and familiar environment of Workbench Meshing

Parameters are set up in Workbench Meshing. ACT drives Fluent Meshing and sends mesh directly to the Fluent solver

Polyhedral mesh in Fluent

ACT

Example: CHT with Forté and Mechanical

• Automatically handle engine-cylinder liner wall, while piston moves past it during engine cycle, to provide appropriate time-average data for CHT analysis

3D IC SimulationForte

3D CHT SimulationThermal Solver

Cycle averaged heat flux

Boundary temperature

ANSYS Fluids at R18.0

• Many new and innovative capabilities• New product licensing for users• Significant enhancements to usability• Powerful new customization tools

Explore Pervasive Fluids Simulation with ANSYS 18.0 today!

感谢聆听